Photo courtesy of UH

Using new DNA barcoding technology, a pair of shark researchers at the University of Hawaiʻi at Mānoa’s Hawaiʻi Institute of Marine Biology have determined a tiger shark caused fatal injuries to a 56-year-old Lahaina man, who was bitten at Maui’s Honolua Bay Dec. 8. By measuring bite marks on the surfer’s board, they have also determined the shark was approximately 14.3-feet-long, as recently reported by UH.

“Prior to the development of these new techniques, uncertainty over the size and species of sharks responsible for bites to people was common. We are absolutely certain that it was a large tiger shark (in the 98th percentile for size), that bit this man,” said HIMB’s Associate Researcher Carl Meyer, a renowned shark expert.

The state Department of Land and Natural Resources, Division of Aquatic Resources collaborated with HIMB to definitively identify the species and to calculate shark size from bite impressions.

Photo courtesy of UH

Using a “swab kit” developed by the HIMB researchers, Adam Wong, a Maui-based DAR education specialist, gathered trace samples of DNA from the bite impression left on the victim’s board. Wong and other DAR staff who respond to shark encounters state-wide are provided with swab kits to help further the understanding of the species and sizes of sharks after encounters.

“Once we received the sample from Maui, we used these new techniques to determine the species and size of the shark involved in the recent Honolua incident,” said Derek Kraft, a Hawaiʻi Sea Grant fellow working at HIMB. “We’re all extremely saddened by the loss of life. These new techniques can be applied in future incidents to help us gain a clearer understanding of these events … which fortunately are quite rare.”

The researchers are confident their method can recover shark DNA from anything that comes in direct contact with a shark, such as a surfboard or stand-up paddle board. They said the method works best if swab samples are taken within hours of an incident, but in this case were still able to recover usable DNA after two-and-a-half days.

Shark DNA Identification Virtual Interviews, Dec. 18, 2020 from Hawaii DLNR on Vimeo.

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